Bash script to export all kubernetes resources as YAML files in a directory structure

backup_cluster.sh

#!/bin/bash

allCRDs=$(kubectl get crd -o name | cut -d '/' -f 2)

nsCRD=""
clusterCRD=""

for crd in $allCRDs; do
  scope=$(kubectl describe crd $crd | grep "Scope" | cut -d ':' -f 2 | sed 's/^ *//g')
  if [ "$scope" == "Namespaced" ]; then
    echo "$crd is namespaced"
    nsCRD="${nsCRD} ${crd}"
  else
    echo "$crd is cluster-wide"
    clusterCRD="${clusterCRD} ${crd}"
  fi
done

nsCrdList=$(echo $nsCRD | tr ' ' ',')
clusterCrdList=$(echo $clusterCRD | tr ' ' ',')

echo "Exporting namespaced resources:"

for ns in $(kubectl get ns --no-headers | cut -d " " -f1); do 
  echo "Found namespace $ns"
  mkdir -p -v "$ns"
  pushd "$ns"

  for n in $(kubectl -n $ns get -o=name pvc,configmap,serviceaccount,secret,ingress,service,deployment,statefulset,hpa,job,cronjob,$nsCrdList); do
    mkdir -p $(dirname $n)
    kubectl -n $ns get -o=yaml "$n" > "$n.yaml"
    echo Exporting ${n}.yaml
  done

  popd

done

echo "Exporting cluster-wide resources:"

for n in $(kubectl get -o=name $clusterCrdList); do
  mkdir -p _cluster/$(dirname $n)
  kubectl get -o=yaml "$n" > "_cluster/$n.yaml"
  echo Exporting _cluster/${n}.yaml
done